BMI (Body Mass Index) Calculation
BMI is the ratio between your weight and your height squared. It's the most widely used indicator in the world to evaluate body size. Simple, fast, but should be interpreted with perspective.
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How is BMI calculated?
The formula is simple: BMI = weight (kg) ÷ height² (m²).
Example: 75 kg for 1.78 m → 75 ÷ (1.78 × 1.78) = 75 ÷ 3.17 = 23.7.
The World Health Organization classifies results into 4 categories: underweight (< 18.5), normal weight (18.5 – 25), overweight (25 – 30), obese (> 30).
The limits of BMI
BMI doesn't distinguish between muscle and fat. A 100 kg rugby player standing 1.80 m tall will have a BMI of 30.9 ("obese") even though he is in peak physical condition.
BMI doesn't take fat distribution into account. Yet abdominal (visceral) fat is much more dangerous than subcutaneous fat. A waist circumference > 94 cm (man) or > 80 cm (woman) is a better indicator of cardiovascular risk.
When to consult?
A BMI outside the 18.5 – 25 range doesn't necessarily mean there's a problem. But if you are overweight or underweight AND you feel fatigue, shortness of breath, or joint pain, it's time to see a doctor or dietitian.
BMI is a starting point, not a verdict. Combine it with other indicators (waist circumference, body fat, physical performance) for a complete view.